EP1112819B1 - Power nut runner with torque responsive power shut-off capacity - Google Patents

Power nut runner with torque responsive power shut-off capacity Download PDF

Info

Publication number
EP1112819B1
EP1112819B1 EP00850223A EP00850223A EP1112819B1 EP 1112819 B1 EP1112819 B1 EP 1112819B1 EP 00850223 A EP00850223 A EP 00850223A EP 00850223 A EP00850223 A EP 00850223A EP 1112819 B1 EP1112819 B1 EP 1112819B1
Authority
EP
European Patent Office
Prior art keywords
clutch
activation element
clutch half
release
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00850223A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1112819A2 (en
EP1112819A3 (en
Inventor
Gunnar Christer Hansson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Atlas Copco Industrial Technique AB
Original Assignee
Atlas Copco Tools AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Atlas Copco Tools AB filed Critical Atlas Copco Tools AB
Publication of EP1112819A2 publication Critical patent/EP1112819A2/en
Publication of EP1112819A3 publication Critical patent/EP1112819A3/en
Application granted granted Critical
Publication of EP1112819B1 publication Critical patent/EP1112819B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/04—Arrangements preventing overload of tools, e.g. restricting load
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/141—Mechanical overload release couplings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers

Definitions

  • the invention relates to a power nut runner of the type comprising a rotation motor for driving an output shaft via a torque responsive release clutch including a driving clutch half, a driven clutch half, and a cam mechanism for transferring torque between the driving clutch half and the driven clutch half, wherein a first one of the driving and driven clutch halves is axially moveable by the cam mechanism in a release direction, from an engagement position to a release position, a spring arranged to bias and displace the first clutch half in an engagement direction, and a clutch release detecting device co-operative with the movable first clutch half.
  • clutch release detecting devices including an activation rod extending axially through the rotor of the motor. Since the activation rod is not rotationally locked to the rotor, there will always be a difference in speed between the rod and the rotor which inevitably results in a frictional wear of the rod.
  • the nut runner further comprises a housing 11 divided into a forward section 12 and a rear section 13.
  • a double planetary type reduction gearing including a first stage 14 with a sun gear 15 rotated by the output spindle 16 of the motor 10, a number of planet wheels 17 journalled on a planet wheel carrier 18, and a ring gear 19 secured in the housing 11.
  • a second stage 20 includes a sun gear 21 formed on the planet wheel carrier 18, a number of planet wheels 22 journalled on a planet wheel carrier 23 and engaging the ring gear 19 which, accordingly, is common to both gearing stages.
  • the planet wheel carrier 23 of the second stage 20 is connected via a coupling member 24 to a driving clutch half 25 of a torque responsive release clutch 26.
  • the release clutch 26 also comprises a driven clutch half 27 which is formed integrally with the output shaft 28 and the screw bit attachment 29 of the nut runner.
  • the driven clutch half 27 includes an annular thrust element 30, a number of torque transferring balls 31, a bias spring 32 for pre-loading the thrust element 30 onto the balls 31, and an adjustable spring support 33. The latter is axially supported by a ring nut 34 threadingly engaging the output shaft 28.
  • the thrust element 30 as well as the driving clutch half 25 are provided with pockets 35 and 36, respectively, for receiving the balls 31 and for transferring torque between the clutch halves 25 and 27, in a conventional way.
  • the pockets 35,36 are formed with slanted side walls which together with the balls 31 accomplish an axial displacement of the thrust element 30 as the clutch halves 25,26 are rotationally displaced relative to each other at a certain predetermined torque load. See Figs. 3a-c .
  • a ball spline connection 38 for enabling a simultaneous torque transfer and axial displacement between the thrust element 30 and the driven clutch half 27.
  • the thrust element 30 is provided with a sleeve member 39 which extends rearwardly from the thrust element 30 into an abutting engagement with an activation element 40.
  • the latter is made of steel and comprises a rearwardly extending sleeve portion 41 and a flange portion 42.
  • the sleeve portion 41 is movably guided on an outer cylindrical surface 43 of the ring gear 19, and an inner part of the flange portion 42 is intended to be abuttingly engaged by the rear end of the sleeve member 39.
  • a number of magnets 44 are mounted in a common plane and in a circle at the rear end of the forward housing section 12 and arranged to generate an attraction force on the flange portion 42 of the activation element 40.
  • the reaction torque from the screw joint is low enough not to make the balls 31 climb the slanted walls of the pockets 35, 36 in the thrust element 30 and the driving clutch half 25, respectively, against the bias load of the spring 32.
  • the activation element 40 occupies its inactive position in which it is drawn against the end of the sleeve member 39 by the magnets 44.
  • each one of the balls 31 will climb up the slanted walls of the pockets 35,36 in the driving clutch half 25 and the thrust element 30 and pass an apex before falling into the next pockets, in a way common to this type of clutch.
  • the thrust element 30 is accelerated very abruptly by the force of the spring 32. This means that the thrust element 30, the sleeve member 39 and the activation element 40 are abruptly accelerated as well, and when the thrust element 30 and the sleeve member 39 are stopped as the balls 31 reach the bottoms of the new pockets, the activation element 40 will continue its movement, to the left in Figs. 2a-c , as a result of its inertia, i.e. the kinetic energy gained during the return movement of the thrust element 30.
  • the activation element 40 will reach its active position, beyond its inactive low torque position as shown in Fig. 2a , such that the sleeve portion 41 gets into a position opposite the sensor 46, thereby making the latter deliver a signal for initiating shut-off of the motor 10. See Fig. 2c .
  • the activation element 40 After having been thrown backwards to its active switch triggering position, the activation element 40 returns immediately to its inactive position, as shown in Fig. 2a , by the attraction force of the magnets 44. In this position the activation element 40 re-assumes its abutting engagement with the sleeve member 39.
  • a Hall-type switch for accomplishing a contact-less activation
  • the invention is not limited to this type of switch.
  • a contact-less activation is preferred because it does not suffer from mechanical wear.
  • magnets for biassing the activation element 40 towards the inactive position of the latter.
  • some type of spring may be used. Magnets are preferred though, because they are not exposed fatigue stresses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
  • Transmission Devices (AREA)
EP00850223A 1999-12-28 2000-12-22 Power nut runner with torque responsive power shut-off capacity Expired - Lifetime EP1112819B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9904793A SE520916C2 (sv) 1999-12-28 1999-12-28 Mutterdragare med momentkoppling med utlösningssensor för kraftavstängning
SE9904793 1999-12-28

Publications (3)

Publication Number Publication Date
EP1112819A2 EP1112819A2 (en) 2001-07-04
EP1112819A3 EP1112819A3 (en) 2003-03-19
EP1112819B1 true EP1112819B1 (en) 2008-03-19

Family

ID=20418315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00850223A Expired - Lifetime EP1112819B1 (en) 1999-12-28 2000-12-22 Power nut runner with torque responsive power shut-off capacity

Country Status (5)

Country Link
US (1) US6662882B2 (sv)
EP (1) EP1112819B1 (sv)
JP (1) JP4897998B2 (sv)
DE (1) DE60038357T2 (sv)
SE (1) SE520916C2 (sv)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE522094C2 (sv) * 2002-02-22 2004-01-13 Atlas Copco Tools Ab Pneumatisk mutterdragare med momentkoppling och en momentokänslig koppling samt ett radiellt låselement för inloppsventilen
US6845279B1 (en) * 2004-02-06 2005-01-18 Integrated Technologies, Inc. Error proofing system for portable tools
DE102004021930A1 (de) * 2004-05-04 2005-12-01 Robert Bosch Gmbh Verfahren zum Betreiben eines Abschaltschraubers sowie Abschaltschrauber
GB2414283A (en) * 2004-05-06 2005-11-23 Dyson Ltd A slip responsive clutch in a vacuum cleaner
US7836968B2 (en) * 2006-03-24 2010-11-23 The Stanley Works Power tool with improved start actuator
JP5201842B2 (ja) * 2007-01-29 2013-06-05 勝行 戸津 電動ドライバーのねじ締めトルク検出装置
SE532395C2 (sv) * 2008-05-08 2010-01-12 Atlas Copco Tools Ab Kraftverktyg för åtdragning av skruvförband samt frikoppling
EP3346087B1 (en) 2008-08-06 2021-05-26 Milwaukee Electric Tool Corporation Precision torque tool
SE0802248L (sv) * 2008-10-22 2010-03-02 Atlas Copco Tools Ab Mutterdragare med en rörelseindikator för ett rörligt momentberoende element i krafttransmissionen
DE102009047698A1 (de) 2009-12-09 2011-06-16 Robert Bosch Gmbh Handwerkzeugmaschine
WO2012061176A2 (en) 2010-11-04 2012-05-10 Milwaukee Electric Tool Corporation Impact tool with adjustable clutch
JP5910858B2 (ja) * 2012-01-16 2016-04-27 日立工機株式会社 チェンソー
DE102013100986A1 (de) * 2013-01-31 2014-07-31 C. & E. Fein Gmbh Schrauber mit elektronischer Tiefenabschaltung
JP2014172164A (ja) * 2013-03-13 2014-09-22 Panasonic Corp 電動工具
US10583894B2 (en) * 2017-09-14 2020-03-10 Honda Motor Co., Ltd. Motor power transmission device
DE102018100665A1 (de) 2018-01-12 2019-07-18 STAHLWILLE Eduard Wille GmbH & Co. KG Auslösemechanismus für ein Drehmomentwerkzeug
DE102018100664A1 (de) 2018-01-12 2019-07-18 STAHLWILLE Eduard Wille GmbH & Co. KG Drehmomentwerkzeug
DE202019106525U1 (de) * 2019-11-22 2021-02-26 C. & E. Fein Gmbh Handwerkzeugmaschine

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3608686A (en) * 1969-12-18 1971-09-28 Thomas B Martin Sr Automatic release clutch
US4019589A (en) * 1975-12-02 1977-04-26 Chicago Pneumatic Tool Company Pulse motor nut runner
SE434358B (sv) 1977-07-07 1984-07-23 Katsuyuki Totsu Eldriven skruvdragare med automatisk planetkopplingsmekanism och kulkoppling for avbrytning av kraftoverforingen
CH648507A5 (fr) * 1982-09-22 1985-03-29 Cerac Inst Sa Machine frappeuse electrique.
DE3323251A1 (de) * 1983-06-28 1985-01-10 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen Getriebe mit ueberlastsicherung, insbesondere fuer den antrieb von kohlenhobeln u.dgl.
US4721169A (en) * 1986-05-14 1988-01-26 Matsushita Electric Industrial Co., Ltd. Electric driver with torque-adjustable clutch mechanism
US4712456A (en) * 1986-07-02 1987-12-15 Top Driver Enterprise Co., Ltd. Electric torsion-controlled screwdriver with an improved automatic turn-off device
SE461510B (sv) 1986-11-27 1990-02-26 Atlas Copco Ab Aktiveringsarrangemang vid elektrisk skruvdragare
DE4019895C2 (de) * 1990-06-22 1999-04-08 Ceka Elektrowerkzeuge Ag & Co Verfahren und Vorrichtung zur Steuerung des Betriebs von Elektrohandgeräten
SE466896B (sv) 1991-01-10 1992-04-27 Atlas Copco Tools Ab Kraftskruvdragare
DE4204947A1 (de) * 1992-02-19 1993-08-26 Scintilla Ag Kraftgetriebene handwerkzeugmaschine
US5346023A (en) * 1993-02-11 1994-09-13 Hitachi Koki Company Limited Slipping torque changing apparatus for impact tool
DE4344849A1 (de) * 1993-12-29 1995-07-06 Fein C & E Werkzeugmaschine
US5553675A (en) * 1994-06-10 1996-09-10 Minnesota Mining And Manufacturing Company Orthopedic surgical device
DE19527192A1 (de) * 1995-07-26 1997-01-30 Hilti Ag Schraubgerät
US5738177A (en) * 1995-07-28 1998-04-14 Black & Decker Inc. Production assembly tool
SE507908C2 (sv) * 1996-09-16 1998-07-27 Atlas Copco Tools Ab Kraftmutterdragare med avstängning
EP1024927A1 (en) * 1997-09-26 2000-08-09 Atlas Copco Tools Ab Power nutrunner with shut-off
JP3744207B2 (ja) * 1998-06-30 2006-02-08 松下電工株式会社 トルククラッチ付き電動締付工具

Also Published As

Publication number Publication date
SE520916C2 (sv) 2003-09-09
US20010004940A1 (en) 2001-06-28
EP1112819A2 (en) 2001-07-04
JP2001232577A (ja) 2001-08-28
EP1112819A3 (en) 2003-03-19
SE9904793D0 (sv) 1999-12-28
DE60038357T2 (de) 2009-07-09
SE9904793L (sv) 2001-06-29
JP4897998B2 (ja) 2012-03-14
DE60038357D1 (de) 2008-04-30
US6662882B2 (en) 2003-12-16

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